Page 14 - CITS - Welder - Trade Theory

WELDER - CITS

MODULE 1 : Induction Training & Welding Safety Process

Lesson 1 - 3 : Importance of welding in industry

Objectives
At the end of this lesson you shall be able to
• realise and state the importance of welding in industry
• state the advantages of welding over other methods of joining metals.

In industries, welding is extensively used either in fabrication works or in repair and maintenance Jobs. Welding
as a means of fabrication imparts great flexibility in the design of jobs. Welded structures are comparatively
simple in design and cheaper as well as the use of patterns etc is eliminated. In welding a considerable saving is
obtained in production cost. Abrupt changes or improvement in the design of a job may be made easily, directly
and immediately by welding where as to bring any change in a casting design involves lot of Complicacies. The
cost of material used in welded structures is also lower because the materials often used are of standard forms
and sizes and of advantage strength. Less machining is required on welded structures. In condition of weight
also the welded structures are lighter than cast ones. The rate of labour cost is also reduced because fewer man
hours of production are involved in welding. In repairing works also welding is the cheapest and quickest way of
meeting the requirement of joining metal parts together.
As already mentioned, welding is used in every phase off all types of metal Industries; however it is more
extensively used in following industries.
i Air Craft manufacturing.
ii Automobiles.
iii Ship building industries.
iv Structural work in bridges and buildings.
v Oil industries.

vi High speed rail road cars..
vii Mining equipments.
ix Manufacturing of furnaces and boilers.
x Military war equipment.

xi Steel-mill equipment
xii Machine tool industry.
xii Die and tool manufacturing.
xiv Repairing and construction of mild steel structures
Advantages of welding

1 Welding equipment is not very costly.
2 Weld is as strong as the base metal.
3 Freedom in design is possible in welding.
4 Similar and dissimilar metals can be welded easily.

5 Welding can be automatic and mechanised.
6 Portable welding equipment is available and can be taken to the site easily.
7 Both pressure and fusion welding are applicable on different Jobs.
8 With modern welding techniques all alloys can be welded with good finish.

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